JPS62215697A - lubricating oil composition - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a lubricating oil composition that reduces wear and friction in sliding parts of automobile engines, machine tools, etc.

[Conventional technology]

Currently, equipment such as automobile engines and machine tools has entered an era of high speed, and there is a risk of severe wear and friction occurring in sliding parts, and the lubricating oil used there is often exposed to high temperatures. ing. Therefore, various improvements have been made to the lubricating oils used.

For example, zinc sialkyl dithiophosphate (ZnDTP) is commonly added to engine oils as a wear and antioxidant agent. However, this additive has a high friction coefficient of 0.1 and contains phosphorus in its structure, so
Since the exhaust gas catalyst is poisoned by this combustion product, the amount added is limited.

This results in fuel efficiency and long life of the exhaust catalyst.

From the viewpoint of cost reduction, there is a need for additives that are phosphorus-free and have excellent friction and wear reduction effects. Molybdenum dithiocarbamate (MoDTO), which is an organic molybdenum-based friction modifier, has been reported as an additive having this performance (Japanese Patent Laid-Open Nos. 52-106824, 1983-6).
No. 2894, "Lubrication" VoL, 28. 5. P538～
P 3 A 2 (1983).

"Toyota Technology" Volume 27, No. 2, P192-P211
(1977)). However, when the wood inventors investigated, it was not possible to obtain sufficient friction and wear reduction effects with this additive alone.

Therefore, the inventors of the present invention conducted various studies regarding the above-mentioned problems, and focused on detergent dispersants that are blended into engine oil. This detergent/dispersant is used to prevent oil deterioration products (wacker, varnish, etc.) from being deposited inside the engine by absorbing them onto metal surfaces. However, extreme pressure additives blended into engine oil to reduce friction and wear also adsorb onto metal surfaces, so if zero elastic pressure additives and detergent dispersants coexist, the detergent dispersant has the same effect as the extreme pressure additive. It is reported that it inhibits the
No., P169-P180 (1982).

“Idemitsu Oil Technical Journal JVOL, 28. Nagi 3. P310~F!
+17 (1985)).

[Problem that the invention seeks to solve]

The present inventors have further studied the above additives and have found that a specific combination of additives exhibits an excellent friction/wear reducing effect.

That is, the present invention provides a lubricating oil composition that has sufficient friction and wear reducing effects.

[Means for solving problems]

The lubricating oil composition of the present invention comprises a lubricating oil and a molybdenum dialkyldithiocarbamate (hereinafter referred to as "molybdenum dialkyl dithiocarbamate").

MoDTO) and a metal detergent/dispersant.

The lubricating oil used in the present invention is animal oil.

These include vegetable oil, mineral oil, synthetic lubricating oil, etc., and are not particularly limited. For example, mustard oil, fish oil, mineral oil or dioctyl adipate, dioctyl sepacate, didecyl succinate/L7. Examples include poly a-olefins, and one type or a mixture of two or more of these is used.

In addition, -1: Livedenedialkyldithiocarbamate (
MoDT(3)t's - is represented by the following chemical formula (A). There are five types of combinations of m and n in the formula. In the present invention, all of the above five types can be used, and one type or fl- of these can be used in a mixture of two or more types.

(In the formula, phantom and R2 are meta hydrocarbon groups having 1 to 24 carbon atoms. They may be the same or different. m and n are integers of 0 or more, m -) - n = 4. ) This blending amount of MoDTC makes it difficult to exhibit a concentration of 0.01 to 0.2 molybdenum (MO) in the lubricating oil. Even better effects can be obtained within the range of 0.05 to 0.10 vrt%.

Additionally, detergents and dispersants generally have polar properties.

It strongly adsorbs to solid surfaces and exhibits a dispersing effect on particles and a rust-preventing effect on metal surfaces.This cleaning/dispersing agent contains metal-based cleaning/dispersing agents, succinimide, benzylamine, succinic acid ester A/ .

Ashless detergent and dispersants such as copolymerized polymers are used. In addition, the book
Ashless detergent dispersants do not exhibit the excellent lubricating effect of the present invention.

Examples of the Kamishi metal-based detergent and dispersant include sulfonate, phenate, honufonate, salicylate, etc., and one type or a mixture of two or more of these can be used.

The blending amount of the metal detergent and dispersant C is as follows:
0. Converted to sulfur concentration for lubricating oil. OO5~Q,2
A range of wt% is desirable. In addition, regarding metallic detergent dispersants that do not contain sulfur such as salicylate, the concentration of metal elements contained in lubricating oil is 0.05 to Q.9
A blending amount in the range of wt% is desirable. When the blending amount is outside the above range, it becomes difficult to exhibit the excellent lubricating effect of the present invention.

By blending the MoDTO and the metal-based detergent-dispersant into the lubricating oil composition, the antioxidant performance of MoDTO and the detergent-dispersibility of the metal-based detergent-dispersant 1 wI
It maintains its neutralizing ability and improves the friction and wear reduction effect through the synergistic effect of both.

The lubricating oil composition of the present invention has the above-mentioned component parts (1 lubricating oil,
b) MoDTO, ((+)) may be composed only of a metal-based detergent and dispersant, but if necessary.

Antioxidants, rust preventives, anticorrosive agents, etc. may be added to improve the thermal stability of the lubricating oil composition and the rust prevention and corrosion resistance of sliding members.

The lubricating oil composition according to the present invention is manufactured by a conventional method for manufacturing lubricating oil compositions.

〔Effect of the invention〕

According to the present invention, it is possible to provide a lubricating oil composition 7 with excellent friction and wear reducing effects. this is.

This is due to the synergistic effect of MoDTC and the metal detergent/dispersant blended into the lubricating oil composition.

In addition, the lubricating oil composition of the present invention can be used in sliding parts of a wide variety of mechanical devices, and is particularly useful for improving fuel efficiency when used in automobile engines, and when using metallic detergents and dispersants that do not contain phosphorus. The present invention will be described in detail below.

In the formula (A), m=2. A lubricating oil composition was prepared by blending MoDTC with n = 2 and the metallic detergent dispersant shown in Table 1 in mineral oil (with a viscosity of 961111''/'3 at 40 ° C.). The amount is 0.06W"t%, t% in terms of Mo concentration relative to mineral oil.
1 m of the metal detergent/dispersant formulation contains 0 to 0.2 w of nuphonate and hunate in terms of sulfur concentration compared to mineral oil.
t%, salicylate was in the range of 0 to Q, 9 wt% in terms of metal element concentration based on mineral oil.

A lubricity test was conducted on the lubricating oil composition prepared above using a cross-bin type lubricating oil tester. As shown in Figure 1, this cross-pin type lubricating oil tester consists of a pair of 8UJ21! ! Round bars (bottles) 1.2'i are arranged at right angles to each other, one bottle 1 is rotated, the other bottle 2 is fixed, and pressed with an air cylinder 3, and the test is performed with the pair of bottles in point contact. It is. temperature in g
Calculate the logarithm of the knot. This wear diameter and friction coefficient are used as indicators of lubricity. The test conditions were: the number of rotations of the rotating bottle 1 was 60 Orpm, and the load was 12. bkq-f, oil temperature 80℃
.

The test time was 1 hr.

Table 1 The results of the above lubricity test are shown in Figures 2 to 13.The horizontal axis shows the metal-based cleanliness in Figures 2 to 9.
The figure shows the compounding amount converted to the metal element concentration of the metal-based cleaning dispersant, and Figures 10 and 11 show the compounding amount (Cawt%) converted to the calcium concentration.

Figures 12 and 15 show the amount (Mgwt%) converted into magnesium concentration. The vertical axis also shows calcium sulfonate in Figures 2 and 5, barium sulfonate in Figures 4 and 5, magnesium sulfonate in Figures 6 and 7, calcium phenate in Figures 8 and 9, Figure 11 shows the force psium salimelate, 12th and 15th
The figure shows the results when magnesium salicylate was blended.

In addition, for comparison, a lubricity test was conducted in the same manner as above by blending a metal detergent and dispersant into the same mineral oil as above but without MoDTC. The results are shown in Figures 2 to 15.

In each figure, the curve P is the result when a single metallic detergent/dispersant is used.

It can be seen from FIGS. 2 and 6 that when psium phonate is used as a metal-based detergent and dispersant, friction and wear are reduced in the entire range tested in this example.

Furthermore, when Barium Nulphone-1'' is used as a metal-based detergent and dispersant, as shown in Figs. It can be seen that the reduction in the amount of metal detergent and dispersant is effective within a range of 0.08 wt% or less.

In addition, when Magnesicum μphonate is used as a metallic detergent and dispersant, as shown in Figures 6 and 7, the reduction in friction is observed in all areas tested, and the amount of metallic detergent and dispersant is 0°Q in terms of reduction in wear. It can be seen that it is effective in a range of 4 wt% or less.

In addition, when using p-sium powder as a metal-based detergent and dispersant, as shown in Figures 8 and 9, the amount of metal-based detergent and dispersant added was significant in terms of reducing friction in all areas tested, and in terms of reducing wear. It can be seen that it is effective in a range of 0.175 wt% or less.

Furthermore, when calcium salicylate is used as a metal detergent and dispersant, as shown in Figures 10 and 11, the reduction in friction was achieved in all areas tested, and the amount of metal detergent and dispersant was 0 and 45 wt in terms of reduction in wear. It can be seen that the effect can be seen within a range of % or less.

Furthermore, when magnesium salicylate is used as a metal detergent and dispersant, as shown in Figures 12 and 13, friction is reduced in all areas tested, and wear is reduced when the amount of metal detergent and dispersant is 0.8%. It can be seen that it is effective in the range of wt% or less.

Comparative Example MoDTO in mineral oil similar to Example 1 (same as Example 1)
A lubricating oil composition was prepared by blending the lubricant with the ashless detergent and dispersant shown in Table 2, and a cross-pin type lubricant test was conducted under the same conditions as in Example 1 using a certain test machine. Ta. The blending amount of MoD'l'C is 0.06 wt% in terms of Mo concentration based on mineral oil, and the blending amount of ashless detergent and dispersant is 0 to 0% in terms of nitrogen (N) concentration based on mineral oil.
Q: It was set in the range of 1wt%.

Table 2 The above lubricity test results are shown in Nos. 14 to 17. In addition, the horizontal axis shows the blending amount (converted to nitrogen concentration) of the ashless detergent and dispersant (
8 wt%), the vertical axis is the 14th and imide, the 16th and 1
Figure 7 shows the results when benzylamine was added.

For comparison, a lubrication test was conducted in the same manner as above, using the same mineral oil as above but without Mo1JTC, mixed with an ashless detergent and dispersant. The results are shown in Figures 14 to 17.

In each figure, curve X is ashless detergent dispersant weight 1 curve Y is MoD
These are the results when TC and an ashless detergent and dispersant were blended.

As is clear from FIGS. 14 to 17, even when MoDTO and the ashless detergent/dispersant were combined, the lubricity did not improve and no interaction between the two was observed.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a cross-pin type lubricating oil tester. FIGS. 2 to 13 are diagrams showing the results of the lubricity test of Examples, and FIGS. 14 to 17 are diagrams showing the results of the smoothness test of Comparative Examples. 1.2...Cross bin.

Claims (2)

[Claims] (1) A lubricating oil composition characterized by comprising a lubricating oil, a molybdenum dialkyl dithiocarbamate, and a metal detergent and dispersant. (2) The lubricating oil composition according to claim (1), wherein the metal detergent and dispersant is one or more of sulfonates, phenates, salicylates, and phosphonates.